Add previous state to beforeReplace event

Author: josh

jquery.pjax.js

@@ -253,6 +253,8 @@ function pjax(options) {
       return
     }
 
+    var previousState = pjax.state;
+
     pjax.state = {
       id: options.id || uniqueId(),
       url: container.url,
@@ -273,7 +275,7 @@ function pjax(options) {
 
     if (container.title) document.title = container.title
 
-    fire('pjax:beforeReplace', [container.contents, options])
+    fire('pjax:beforeReplace', [container.contents, options, previousState])
     context.html(container.contents)
 
     // FF bug: Won't autofocus fields that are inserted via JS.
@@ -447,9 +449,10 @@ function onPjaxPopstate(event) {
       if (contents) {
         container.trigger('pjax:start', [null, options])
 
+        var previousState = pjax.state;
         pjax.state = state
         if (state.title) document.title = state.title
-        container.trigger('pjax:beforeReplace', [contents, options])
+        container.trigger('pjax:beforeReplace', [contents, options, previousState])
         container.html(contents)
 
         container.trigger('pjax:end', [null, options])

test/unit/pjax.js

@@ -542,11 +542,12 @@ if ($.support.pjax) {
 
     frame.$("#main")
          .text(beforeContent)
-         .on("pjax:beforeReplace", function(event, contents, options) {
+         .on("pjax:beforeReplace", function(event, contents, options, previousState) {
       ok(event)
       ok(contents)
       equal($(event.target).text(), beforeContent)
       equal(options.url, "hello.html")
+      ok(previousState.url.match("/home.html"))
       ok(frame.$.pjax.state.url.match("/hello.html"))
     })
     frame.$("#main").on("pjax:success", function(event) {
@@ -861,13 +862,15 @@ if ($.support.pjax) {
       equal(frame.location.pathname, "/hello.html")
       ok(frame.history.length > 1)
 
-      frame.$('#main').on('pjax:beforeReplace', function(event, contents, options) {
+      frame.$('#main').on('pjax:beforeReplace', function(event, contents, options, previousState) {
         ok(event)
         ok(contents)
         equal(frame.location.pathname, "/home.html")
+        ok(options.url.match("/home.html"))
+        ok(previousState.url.match("/hello.html"))
+        ok(frame.$.pjax.state.url.match("/home.html"))
         // Remember: the content hasn't yet been replaced.
         notEqual($(event.target).html(), originalContent)
-        ok(frame.$.pjax.state.url.match("/home.html"))
         start()
       })